Swimming Pool Main Drains
Main drains are installed in the bottom of most in-ground swimming pools. They
perform a function similar to a skimmer
in that they allow water to go from the pool to the filter system to be cleaned.
Main drains do not have baskets to trap debris from getting to the pump and filter
so keeping your pool clean and clear of debris will allow the system to run well
and help circulate the chemicals.
What does it look like, you ask? It looks like a large white (or black, for dark
marbledusted pools) circle or rectangular grate on the bottom of the pool, in the
deep end. If you see multiple circles or grates at the bottom of the pool, you
may also have hydrostatic valves, which keep the water pressure inside and outside
of the pool equal, in high water-table areas.
Here's a sample of Main drains------>
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